Heater



aepit, 17, 1%35. R G BIRKHOLZ 2.,,@14 414 HEATER Filed Sept. 14, 1932 FIG,i FIG 2 VHHIII 2 Z EM de f 25 A 5; 5 Z8 2 :1 I 1" Ins.d Z0

E32 #7 O O l J Patented Sept. 17, 1935 Richard Birlrholz, lllilwaulree, Wis, assignor to Mid West Ventilating Works, Milwaukee, Wis, a corporatien of Wisccnsi Application September 14, 1932, Serial No. 633,058

3 Claims.

a; electric heater of this character arranged within a recess in a building wall for room heating purposes, the heater having an apertured front plate which carries a heating element and fan and which is detachably secured to the wall to form air passages with the wall recess.

The invention further consists in the several features hereinafter described and claimed.

In the accompanying drawing, Fig. 1 is a front view of the heater;

Fig. 2 is a. sectional view taken on the line 22 of Fig. 1 and showing the heater embodied in a building wall;

Fig. 3 is fragmentary rear View of the heater, and

Fig. 4 is a detail sectional view taken on the line ll of Fig. 1.

In this drawing, the numeral ill designates a building wall having a recess 9 l within which is mounted a rectangular metal box or casing l2 open at the front. The casing i2 is preferably embedded in place during the erection of the wall and has its front edges substantially flush with the face of the wall. An electric conduit 83 is secured to a wall of the casing, here indicated to be the rear wall. Angle clips i i are secured, as by rivets E5, to the opposite side walls of the casing near its front edge.

A rectangular front plate it, preferably of cast metal, has marginal portions resting on the wall Iii about the recess ii and has a flange or rib l'l fitting within the front edge of the casing l 2. The front plate is secured in place by screws l8 passing through the plate and the angle clips hi and threaded into nuts l9 engaging the rear faces of the clips.

The flange ll surrounds a deeper flange 20 which projects rearwardly from the front plate to form a rectangular partition or baffle. Air inlet openings ii are formed in the front plate around the flange Bil, and a rectangular air outlet opening 22 is formed in the front plate within the flange 2d. The front plate has a flange 23 which defines the edges of the air outlet opening.

A wire grille 2 covers the air outlet opening 22 and bears against the inner face of the flange 23 where it is held by metal bars 25 and insulating bars 25. The metal bars 25 are secured by screws 2'! to the inner side walls of the partition flange 2i], and have bent end portions 28 to which the insulating bars 25 are secured by screws 2% to extend horizontally adjacent the upper and lower walls of the partition flange. Headed pins are driven into the rear faces of the insulating bars 2% to support thereon a heating element St arranged in zig-zag relation and having its ends connected to terminal screws carried in insulating bushings 33 mounted. in the lower wall of the partition flange 20.

A. pair of rearwardly projecting arms 34 are formed on the opposite side walls of the partition flange 2t and have secured thereto by screws 35 the end portions of a horizontally excross bar 33. An electric motor 3'! is disposed in front of the cross bar 36 and is secured thereto by screws 38. The motor shaft is perpendicular to the front plate iii and carries a fan arranged centrally within the partition flange 29 and behind the heating element 3|,

the flange 2d surrounding the heating element and fan.

A switch id, here indicated to be of the toggle type, is disposed below the air outlet opening and is secured to the rear face of the front plate by screws M, the lever for the switch eX- tending through a slot 12 in the front plate. 'ine conductors 33 extend through the conduit it and are connected to the switch, sufficient slack being left in the conductors to permit their connection when the front plate is detached from the wall. Conductors i l connect the switch with the terminal screws of the heating element 3i, and conductors connect the switch with the electric motor 37. it is mounted in the front plate above the air outlet opening, and is connected to the line terminals of the switch by conductors M.

In use, the closing of the switch 50 causes An electric clock current to flow through the heating element 3| and the fan motor 377. The fan draws air from the room through the inlet openings 2! in the front plate and discharges the air against the heating element St and through the outlet opening 22, the air being heated as it sweeps past the building wall of ordinary thickness without projecting materially from the face of the wall. The fan preferably draws air from the top, bottom, and sides of the casing cavity, so as to insure full fan capacity even though a comparatively shallow casing is used.

What I claim as new and desire to secure by Letters Patent is:

1. A heater comprising a front plate adapted to be secured to a building wall to cover a recess in said wall and to form an air chamber with said recess, there being an air inlet communicating with said chamber, said front plate having an air discharge opening and having an inwardly projecting flange surrounding said opening and spaced from the rear wall of said recess, a heating element carried by said front plate behind and in register with said air discharge opening and within said flange, an electric motor carried by said front plate behind said heating element and adjacent the rear wall of said recess, and a propeller fan drivingly supported by the motor at the front of the motor and disposed within said flange for moving a current of air forwardly against said heating element and through said discharge opening.

2. An air circulating device comprising a front plate adapted to be secured to a building wall to cover a recess in said wall and to form an air chamber with said recess, there being an air inlet communicating with said chamber, said front plate having a discharge opening and an inwardly projecting flange surrounding said discharge opening and spaced from the walls of said recess, a pair of spaced arms carried by and projecting rearwardly from said front plate and into said chamber, a cross bar supported by said arms, an electric motor carried by said cross bar, and a propeller fan in front of and driven m by said motor and disposed in front of said cross g bar and within said flange for moving a current of air through said discharge opening.

3. An air circulating device comprising a front plate adapted to be secured to a building 15 wall to cover a recess in said wall and to form an air chamber with said recess, there being an air inlet opening communicating with said chamber, said front plate having a discharge opening and an inwardly projecting flange sur- 

